Welch 8890A Gem 1 – Direct Drive Rotary Vane Vacuum Pump

The Welch 8890A Gem 1 is a compact, oil-sealed, two-stage rotary vane vacuum pump designed to deliver reliable vacuum performance for both laboratory and light industrial applications. With a pumping speed of 31 liters per minute and ultimate pressures reaching approximately 0.050 Torr, it provides dependable results for processes that require moderate vacuum levels. Its lightweight build, quiet 58 dBA operation, and direct drive motor make it an efficient choice for research labs and pilot facilities looking for a balance of power, portability, and ease of use.

At HiTechTrader, we make trusted vacuum technology like the Welch 8890A Gem 1 more accessible by offering carefully refurbished pumps that are fully tested, serviced, and ready for long-term operation. Researchers and engineers can depend on these pumps for consistent performance with rotary evaporators, vacuum ovens, and other lab systems, all at a fraction of the cost of new equipment. Backed by warranty and technical support, each unit provides both performance assurance and budget-friendly value.

Key Features

1. Pump Type: Direct drive, two-stage rotary vane vacuum pump
2. Pumping Speed: 31 L/min (1.1 CFM)
3. Ultimate Pressure: Down to ~0.050 Torr
4. Motor: 1/4 HP motor, 3450 RPM
5. Oil Capacity: 0.48 quarts (0.45 L) vacuum pump oil
6. Inlet: Barb fitting for 1/4" NPT connection
7. Exhaust: 3/4-20 threaded fitting
8. Power Supply: 115 V, 60 Hz, single-phase, North American plug
9. Dimensions: 14.5" L × 5.1" W × 8.4" H
10. Weight: 24.5 lbs (11.1 kg)
11. Noise Level: 58 dBA
12. Recommended Tubing: 3/8" inner diameter

Performance and Applications

1. Ideal for processes requiring vacuums below 50 Torr
2. Commonly paired with rotary evaporators, vacuum ovens, and lab filtration systems
3. Oil-sealed design enhances chemical compatibility and minimizes contamination risk
4. Optional exhaust oil recycler reduces oil mist discharge
5. Not recommended for continuous operation above 50 Torr (to prevent oil misting)

Maintenance and Operation

1. Routine oil changes required for sustained performance
2. Direct drive eliminates belts, lowering maintenance needs
3. Can be mounted in multiple orientations with backflow protection
4. Spare parts, hoses, and consumables are readily available for long-term service
5. Proper safety precautions required to prevent solvent vapor damage

Why Buy from HiTechTrader?

HiTechTrader specializes in delivering high-quality refurbished vacuum pumps that meet the rigorous demands of laboratory and industrial environments. Every Welch 8890A Gem 1 is inspected, serviced, and performance-tested to ensure reliable operation under real-world conditions. With decades of experience in laboratory equipment and a commitment to value, we provide customers with cost-effective solutions that extend lab capabilities without exceeding budgets. Choosing HiTechTrader means gaining both trusted performance and dependable long-term support.